A murder investigation propels the team to London in pursuit of their suspects.

The team race against the clock in London to solve two murders, after their prime suspect is found dead. Meanwhile, Dwayne has an emotional encounter and Humphrey finds that some advice from an unexpected source helps him come to a big decision.

Long-buried memories are raked up for JP when someone from his past is caught red-handed at a murder scene and Jack must unravel a complex mystery to find the truth.

When Billy Springer, lead guitarist of a popular reggae band, is murdered, DI Mooney and his team must crack a cold case that has haunted the Commissioner for years, before they can arrest the killer. After performing on stage as part of Leon And The Ragers 30-year reunion gig, Billy is found dead moments later in his dressing room.